power supply

(redirected from Wall adapter)

power supply

[′pau̇·ər sə‚plī]
(electronics)
A source of electrical energy, such as a battery or power line, employed to furnish the tubes and semiconductor devices of an electronic circuit with the proper electric voltages and currents for their operation. Also known as electronic power supply.

power supply

power supply

A system that converts AC current from the wall outlet into the DC currents required by electronic circuits. A computer power supply converts AC into multiple DC voltages. For example, 12 volts is commonly used for drives, while 3.3v and 5v are used by the chips and other motherboard components.

Switching Power Supplies
Power supplies known as "switching" power supplies are commonly used. Their name is derived from the type of circuit used to change the voltage. For more details, see transformer. See power adapter.


Typical Voltages
This monitor displays the typical three voltages generated by a PC power supply.







One Size Does Not Fit All
Like everything else in our high-tech world, power supplies come in myriad sizes and shapes; witness this table full of different units from Sparkle Power Inc. (www.sparklepower.com).







External "Bricks"
Laptops use an external power supply, called a "power adapter" or "power brick." It converts AC to a single DC voltage that goes to the laptop's internal power supply, which generates all other required voltages. External adapters are used to reduce the size and weight of the laptop, yet they typically ride along in the laptop case, adding back the weight after all.
References in periodicals archive ?
5 watts pad, if the wall adapter is of 5 watts, the phone will only charge at 5 watts.
Tenders are invited for 5 ea adapter: positive dc wall adapter, 9v dc / 500ma, 2.
The transmitter can be powered using the internal 6 AA rechargeable batteries for six to eight hours of continuous use or from the AC/DC wall adapter.
0 applications while still offering a single cable solution, no wall adapter needed.
The USB can also be plugged into a standard Apple wall adapter forcontinued battery life.
You can charge the battery inside the Wireless Plus either via connecting is to the USB port of by conecting the power-pin to the wall adapter.
The battery can be recharged via a PC or USB +5 V wall adapter.
The accessory draws power from the tablet, or you can charge it and the tablet at the same time by using a wall adapter.
An AC wall adapter and a cigarette-lighter DC power cable are also available as options.
It operates for approximately 100 hr with a single 9-V alkaline battery or may be powered from the supplied AC wall adapter.
The unit operates via 6V wall adapter or set of four C-cell batteries.
Just plug it into the end of an extension cord to recharge; no wall adapter needed.